656630089 has 2 divisors, whose sum is σ = 656630090. Its totient is φ = 656630088.

The previous prime is 656630087. The next prime is 656630119. The reversal of 656630089 is 980036656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532686400 + 123943689 = 23080^2 + 11133^2 .

It is a cyclic number.

It is not a de Polignac number, because 656630089 - 2¹ = 656630087 is a prime.

Together with 656630087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (656630087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328315044 + 328315045.

It is an arithmetic number, because the mean of its divisors is an integer number (328315045).

Almost surely, 2^656630089 is an apocalyptic number.

It is an amenable number.

656630089 is a deficient number, since it is larger than the sum of its proper divisors (1).

656630089 is an equidigital number, since it uses as much as digits as its factorization.

656630089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 656630089 is about 25624.7944186875. The cubic root of 656630089 is about 869.1744002059.

The spelling of 656630089 in words is "six hundred fifty-six million, six hundred thirty thousand, eighty-nine".